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Wetlands have many functions that are beneficial. This module will discuss the following functions of wetlands: 1  wetlands filter harmful substances. 2  wetlands protect against floods. 3  wetlands protect against erosion.4  wetlands provide food and habitat.5  wetlands save people money.his module will discuss the following functions of wetlands: 1  wetlands filter harmful substances. 2  wetlands protect against floods. 3  wetlands protect against erosion. 4  wetlands provide food and habitat.
Wetlands are important for so many reasons: The Role of Wetlands in an Ecosystem. Wetlands prevent flooding by holding water much like a sponge. By doing so, wetlands help keep river levels normal and filter and purify the surface water.